Wireless power transfer system for deep-implanted biomedical devices

Iqbal, Amjad; Sura, Penchala Reddy; Al-Hasan, Muath; Mabrouk, Ismail Ben; Denidni, Tayeb A.

Abstract

In this paper, a dual-band implantable rectenna is proposed for recharging and operating biomedical implantable devices at 0.915 and 2.45 GHz. The rectenna system consists of a compact dual-band antenna based on a meandered-resonator as well as efficient dual-band rectifier circuit. Both components (antenna and rectifier) are integrated inside a capsule device to simulate and experimentally validate the rectenna. The antenna occupies lower volume (5×5.25×0.25 mm3), where compactness is achieved using meandered geometry and a slotted ground plane. It maintains quasi-omnidirectional radiation patterns and peak realized gains of −22.1 dBi (915 MHz) and −19.6 dBi (2.45 GHz); thus, its capability is enhanced to harvest the ambient energy from multiple directions. Moreover, a dual-band rectifier is designed using a dual-branch matching network (an L-matching network and open-circuited stub in each branch) with a radio frequency (RF) to direct current (DC) conversion efficiency of 79.9% for the input power of 1 dBm (lower band: 0.915 GHz) and 72.8% for the input power of 3 dBm (upper band: 2.45 GHz). To validate the concept of the rectenna, the implantable antenna and rectifier are fabricated and attached together inside a capsule device, with the measured results verifying the simulated responses. The proposed rectenna efficiently rectifies two RF signals and effectively superimposes on a single load, thus, providing a distinct advantage compared to single-band rectennas. To the best of the authors’ knowledge, this is the first-ever implantable rectenna to perform dual-band RF signal rectification.

Citation

Iqbal, A., Sura, P. R., Al-Hasan, M., Mabrouk, I. B., & Denidni, T. A. (2022). Wireless power transfer system for deep-implanted biomedical devices. Scientific Reports, 12, Article 13689. https://doi.org/10.1038/s41598-022-18000-6

• Journal Article Type: Article
• Acceptance Date: Aug 3, 2022
• Online Publication Date: Aug 11, 2022
• Publication Date: 2022
• Deposit Date: Sep 15, 2022
• Publicly Available Date: Mar 15, 2023
• Journal: Scientific Reports
• Electronic ISSN: 2045-2322
• Publisher: Nature Research
• Peer Reviewed: Peer Reviewed
• Volume: 12
• Article Number: 13689
• DOI: https://doi.org/10.1038/s41598-022-18000-6
• Public URL: https://durham-repository.worktribe.com/output/1191717